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Air Quality and Greenhouse Gas Technical Report Griffith Energy Storage Project • Griffith Energy Storage, LLC is proposing to construct and operate the 400-megawatt(MW) Griffith Energy Storage Project (Project)to provide reliable and flexible power to the local electrical system. The property which the Project would be built on consists of 106 acres (Property)of land in San Joaquin County. The site is owned by a private landowner in unincorporated San Joaquin County. To avoid environmental constraints, only an estimated 32 acres of the 106-acre site would be used for the Project. The southwestern corner of the project site will be used for the battery storage project. The Project would interconnect at the Tesla Substation immediately adjacent to the site in Alameda County via a 230-kilovolt interconnection generation tie (gen-tie) line. The energy storage facility is anticipated to house lithium-ion batteries totaling 400 MW of energy. Project construction would commence as early as 2024 and is anticipated to come online as early as 2025. The Property is approximately 0.9 mile southwest of Interstate 580 and approximately 5 miles southwest of the city of Tracy, adjacent to Pacific Gas and Electric's (PG&E)Tesla Substation, as shown on Figure 1. The Project site is private land zoned as Agricultural General-160 and designated as General Agriculture. Division 14, Section 9-115.580 of the San Joaquin County Municipal Ordinance Code allows any major utilities on Agricultural General zoned land through a Site Approval application (San Joaquin County 2021). The air quality analysis presented in this report evaluates the potential air quality impacts associated with the proposed Project. The proposed schedule for construction begins as early as 2024 for a duration of 15 months. Because the majority of the Project is located within the jurisdiction of the San Joaquin Valley Air Pollution Control District (SJVAPCD), the air quality analysis follows SJVAPCD's guidelines. A segment of the gen-tie line is located in Alameda County. Emissions from this segment of the gen-tie line will also be compared to the SJVAPCD's significance thresholds as these are more stringent than the Bay Area Air Quality Management District's (BAAQMD 2017a)significance thresholds, with the exception of particulate matter less than 2.5 microns (PM2.5). The BAAQMD construction significance threshold of 10 tons per year(tpy)will be used for PM2.5. This report also provides estimates of greenhouse gas (GHG) emissions from the combustion of fossil fuels, primarily from construction of the proposed facility. In summary, the air quality and GHG analysis concludes that emissions during short-term construction and during long-term operation of the Project will not exceed the California Environmental Quality Act (CEQA) significant thresholds established by the SJVAPCD and BAAQMD. A health risk assessment (HRA)was not conducted for this Project due to the low level of emissions and the distances to the nearest non-participating sensitive receptors of 1,000 feet. Therefore, the Project does not pose significant adverse impacts on local air quality or global climate change. OTETRA TECH 1 July 2023